O-ring is abbreviated as O-ring, which is a rubber ring with a circular cross-section. O-rings are the most widely used seals in hydraulic and pneumatic sealing systems. O-ring seals have good sealing properties, and can be used for static seals and reciprocating motion seals; not only can be used alone, but also a basic component of many combined sealing devices. It has a wide range of applications. If the material is selected properly, it can meet the requirements of various motion conditions. The working pressure can be from 1.333× 105Pa vacuum to 400MPa high pressure; the temperature range can be from -60°C to 200°C.

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